Answer:
Deploying troops and supplies
Explanation:
The United States entered the WWI in the 6 of April of 1917 when declared the war to Germany and for this date they started drafting men for the war. 2 years after about 2 million of American soldiers have being deployed in France.
As the country declare war against Germany the preparation of labor and food became a priority for the government that taught people how to grow food in their own backyards and secure that labor was consistent to have enough supplies.
One way was the passing of the interstate Commerce Act of 1887
Two of the main factors that can cause a country’s Gross Domestic Product (GDP) per person to change are either an increase or decrease in imports and/or exports, and more foreign investment in domestic products.